SYSTEM FOR MANUFACTURING MEDIUM WITH OVD IMAGE, MEDIUM WITH OVD IMAGE, AND OVD TRANSFER SHEET USED FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To make it possible to enhance design characteristics and a forgery preventive effect and to facilitate the formation of OVD (optical variable devices) varying for every sheet on a medium (medium display). SOLUTION: This system consists of an image input device 41 which reads illustration images, an image data converter 42 which converts the read illustration images to the OVD images and an OVD image output device 43 for printing and transferring the element OVD image groups from a transfer sheet including the element OVD image groups constituting the OVD images by thermal means. The transfer sheet having plural OVD relief patterns is used.